<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
            label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" 
                :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                              <el-cascader expand-trigger="hover" v-model="addForm.goods_cat" :options="catelist" 
                              :props="cateProps" @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的Item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                              <!-- 复选框组 -->
                              <el-checkbox-group v-model="item.attr_vals">
                                    <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                              </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action表示图片要上传的后台API地址 -->
                        <el-upload :action="uploadURL" :on-preview="handlePreview" 
                        :on-remove="handleRemove" list-type="picture" 
                        :headers="headerObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 副文本编辑器组件 -->
                          <quill-editor v-model="addForm.goods_introduce"/>
                          <!-- 添加商品按钮 -->
                          <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                //商品所属的分类数组
                goods_cat: [],
                //图片的数组
                pics: [],
                //商品的详情描述
                goods_introduce: '',
                //存储动态参数和静态属性的数组
                attrs: []
            },
            addFormRules:{
                goods_name:[
                    { required:true, message:'请输入商品名称', trigger:'blur' }
                ],
                goods_price:[
                    { required:true, message:'请输入商品价格', trigger:'blur' }
                ],
                goods_weight:[
                    { required:true, message:'请输入商品重量', trigger:'blur' }
                ],
                goods_number:[
                    { required:true, message:'请输入商品数量', trigger:'blur' }
                ],
                goods_cat:[
                    { required:true, message:'请选择商品分类', trigger:'blur' }
                ]
            },
            //商品分类列表
            catelist: [],
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            //动态参数列表数据
            manyTableData: [],
            //静态属性列表数据
            onlyTableData: [],
            //上传图片的URL地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的headers请求头对象
            headerObj:{
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        //获取所有商品分类数据
        async getCateList(){
           const {data:res} = await this.$http.get(`categories`)

           if(res.meta.status !== 200){
               return this.$message.error('获取商品分类数据失败!')
           }
           this.catelist = res.data
           console.log(this.catelist);
        },
        //级联选择器中项变化，会触发这个函数
        handleChange(){
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            // console.log('即将离开的标签页名字是:'+oldActiveName);
            // console.log('即将离开的标签页名字是:'+activeName);
            // return false
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请先选择商品分类!')
                return false
            }
        },
        async tabClicked(){
            // console.log(this.activeIndex);
            //证明访问的是动态参数面板
            if(this.activeIndex === '1'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{ sel:'many' }
                })
                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数列表失败!')
                }
                console.log(res.data);
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')

                })
                this.manyTableData = res.data;
            }
            else if(this.activeIndex === '2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{ sel:'only' }
                })

                if(res.meta.status !== 200){
                    return this.$message.error('获取静态属性失败!')
                }
                console.log(res.data);
                this.onlyTableData = res.data;
            }
        },
        //处理图片预览效果
        handlePreview(file){
            this.previewPath = file.response.data.url;
            this.previewVisible = true;
        },
        //处理移除图片的操作
        handleRemove(file){
            console.log(file);
            //1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path;
            //2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            //3.调用数组的splice方法，把图片信息对象，从pics数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm);
        },
        //监听图片上传成功的事件
        handleSuccess(response){
            console.log(response);
            //1.拼接得到一个图片信息对象
            const picInfo = { pic:response.data.tmp_path }
            //2.将图片信息对象，push到pics数组中 
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        //添加商品
        add(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项!')
                }
                //执行添加的业务逻辑
                //lodash cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')

                //处理动态参数
                this.manyTableData.forEach(item =>{
                    const newInfo = { 
                        attr_id: item.attr_id , 
                        attr_value: item.attr_vals.join(' ') 
                    }
                    this.addForm.attrs.push(newInfo)
                })

                //处理静态属性
                this.onlyTableData.forEach(item =>{
                    const newInfo = {
                        attr_id: item.attr_id , 
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form);

                //发起请求添加商品
                //商品的名称，必须是唯一的
                const {data:res} = await this.$http.post('goods',form)
                if(res.meta.status !==201){
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功!')
                this.$router.push('/goods')

            })
        }
    },
    computed: {
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>